Doc update

notebooks/ReleaseNotes.ipynb

@@ -35,7 +35,9 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "* Fixed a bug that could cause random decisions to be deterministic (i.e. produce the same result every time) in third-party code importing book classes.\n",
+    "## Version 1.2.1 (released 2023-11-13)\n",
+    "\n",
+    "* Importing book classes from third-party code would accidentally set a fixed random seed, making all further random decisions deterministic (i.e. produce the same result every time). This is now fixed.\n",
     "* Minor updates to Python package requirements."
    ]
   },
@@ -45,8 +47,6 @@
    "source": [
     "## Version 1.2 (released 2023-10-23)\n",
     "\n",
-    "Changes since 1.1:\n",
-    "\n",
     "* For announcements, we now use Mastodon ([@[email protected]](https://mastodon.social/@TheFuzzingBook)) instead of X. <a href=\"https://mastodon.social/invite/3CvrkW9t\">Follow us on Mastodon</a>!\n",
     "* We have a [new chapter on Fuzzing with Constraints](FuzzingWithConstraints.ipynb) in which we introduce the ISLa constraint language / fuzzer / parser.\n",
     "* We have a [new chapter on Compiler Testing](PythonFuzzer.ipynb) in which we use grammars to generate, parse, and evolve Python code.\n",